Just watched the 2 eps with the tac team in and as black watch said they dont light up at all. You could say they need to be acrylic like say with the tie chest square things but then they could be painted plastic.
If they dont light up , or the forearm torch then couldnt you make the painted a lvl 1 and the coloured acrylic a higher one?
As for the battery , something the shape of the 9v covered in white tape but no need to have to actually connected then?